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Finding the Fourth Proportional to 1,990.36, 2,985.42 and 622.36

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Solution

The fourth proportional to 1,990.36, 2,985.42 and 622.36 is: 933.50

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,990.36 : 2,985.42 = 622.36 : x
  2. Step 2: Convert to fraction form
    1,990.36/2,985.42 = 622.36/x
  3. Step 3: Cross multiply
    1,990.36x = 2,985.42 × 622.36
  4. Step 4: Simplify right side
    1,990.36x = 1,858,005.99
  5. Step 5: Solve for x
    x = 1,858,005.99/1,990.36
  6. Step 6: Final answer
    x = 933.50

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Similar ratio
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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.